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142 monme (匁) is about nine-tenths as heavy as a Basketball.

In other words, it's 0.853790215370 times the weight of a Basketball, and the weight of a Basketball is 1.17124790380 times that amount.

(NBA official ball standards, Size 7)A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 166.317202330 monme (匁). These balls have 4,118 pebbles each with a diameter of 2.5 mm